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is a significant concern for physicians. Central
: }; t$ C3 C* ?. P+ `6 ~precocious puberty (CPP), which is mediated
4 F% L; X0 z- S& jthrough the hypothalamic pituitary gonadal axis, has. _" V7 N) w0 E/ ~& w% t* H, [4 u3 g
a higher incidence of organic central nervous system- Z5 s2 X( s4 m" `% r
lesions in boys.1,2 Virilization in boys, as manifested
* J* j7 A K) a( i _$ R1 Sby enlargement of the penis, development of pubic
: K- `2 o% x8 e% m! {hair, and facial acne without enlargement of testi-$ J4 X9 y" o* }5 Z/ ~
cles, suggests peripheral or pseudopuberty.1-3 We
' K6 H8 j: f* t" E4 Mreport a 16-month-old boy who presented with the S* K# r7 x) s- X
enlargement of the phallus and pubic hair develop-4 Y& _5 W& r" @& O" k
ment without testicular enlargement, which was due
1 l! P$ B/ M, N2 uto the unintentional exposure to androgen gel used by0 u: `: g% X3 n. b" \: v: y. `
the father. The family initially concealed this infor- h8 i. N! J: [4 m4 e6 N. Q
mation, resulting in an extensive work-up for this
5 U! u0 G2 H! y' P2 P$ tchild. Given the widespread and easy availability of6 e+ u0 K* b8 Z/ K
testosterone gel and cream, we believe this is proba-
) O8 w- s* Q( c4 Zbly more common than the rare case report in the
& z8 P$ f! i( e8 v- Iliterature.4
4 Z6 [$ Q; K0 b% ]8 e: L5 c: g: x; k; DPatient Report
% o# b- u7 v: t) M' t( |A 16-month-old white child was referred to the/ c3 Z0 M1 n8 r4 a' p1 b! k2 P
endocrine clinic by his pediatrician with the concern% X5 C8 _9 K3 w/ Q- K9 S, t
of early sexual development. His mother noticed! ^% `, l" u" n; u6 K3 G5 }
light colored pubic hair development when he was
8 l& V: a. k7 t5 ~2 z7 EFrom the 1Division of Pediatric Endocrinology, 2University of
+ r0 {* l9 d2 \+ aSouth Alabama Medical Center, Mobile, Alabama." v$ J: J1 f* I' d
Address correspondence to: Samar K. Bhowmick, MD, FACE,
! G8 q# C. L3 N9 SProfessor of Pediatrics, University of South Alabama, College of8 m. A U0 E1 c/ A% a% g
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
# I; {9 l6 A/ S0 v; }2 y: v) e* `4 W$ e0 He-mail: [email protected].( Y3 e6 |: Q) \7 K
about 6 to 7 months old, which progressively became
, d7 o5 f2 K7 F& |1 S8 r& d) `7 p0 wdarker. She was also concerned about the enlarge-# G7 y/ L* R$ |# S/ `
ment of his penis and frequent erections. The child
1 r0 h* K3 Z) r/ T% Twas the product of a full-term normal delivery, with! Z& S8 ^ |# |5 z$ S
a birth weight of 7 lb 14 oz, and birth length of
4 m# q( J) X- z& o: f! W+ ], S$ s9 s20 inches. He was breast-fed throughout the first year3 x' k2 m( C9 J* y7 h) }
of life and was still receiving breast milk along with
& S) k6 r" `* m4 A9 Bsolid food. He had no hospitalizations or surgery,
; L# s1 h. C) ]and his psychosocial and psychomotor development
4 w$ g8 u& d; Q) Swas age appropriate.
9 W1 E5 l9 K1 U% B, I. C' KThe family history was remarkable for the father,
a7 y6 n0 O& y& N1 K. ~who was diagnosed with hypothyroidism at age 16,
- M/ ~; i1 ]9 h2 V( `+ owhich was treated with thyroxine. The father’s5 r. F! |- S/ S+ G0 p
height was 6 feet, and he went through a somewhat, u2 O% R e R$ o, m$ F8 W
early puberty and had stopped growing by age 14.
+ e2 U# |$ C* S8 F' UThe father denied taking any other medication. The& s5 ~2 u. e& T0 H
child’s mother was in good health. Her menarche" U! C! M m- C* q" V) O: E' `
was at 11 years of age, and her height was at 5 feet
, l2 H5 Q. \5 Z( {5 C: I3 Y5 Y; I$ U5 inches. There was no other family history of pre-
5 S/ a6 `4 U i3 L4 Gcocious sexual development in the first-degree rela-
( |5 o$ t2 u4 {0 atives. There were no siblings.
7 i& h) r7 [6 w# nPhysical Examination" m+ l% O6 }1 m1 g/ m# E3 a
The physical examination revealed a very active,
7 d* Q( j @. C$ Pplayful, and healthy boy. The vital signs documented1 M, {' j2 B$ Y) A b. j# L
a blood pressure of 85/50 mm Hg, his length was- j& s% Z: x' s) z8 J
90 cm (>97th percentile), and his weight was 14.4 kg
/ C0 J+ c+ x$ _7 m(also >97th percentile). The observed yearly growth; l& n0 Q5 L/ R( Q2 s- O
velocity was 30 cm (12 inches). The examination of& z9 o/ h5 k: B7 j1 i7 x6 Y
the neck revealed no thyroid enlargement.4 X! i9 W) Q% W9 Y2 J, J
The genitourinary examination was remarkable for) L6 Y$ G1 p: P, A( U8 Z: W
enlargement of the penis, with a stretched length of
7 r3 q& u1 o4 ]0 A+ N& f8 cm and a width of 2 cm. The glans penis was very well
* Z0 A# g) x9 }7 X/ l) cdeveloped. The pubic hair was Tanner II, mostly around& K$ P! s9 i7 U% @
540, B, ?2 `- o# u7 G6 U+ K& X( z
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from' @- B* ^/ e; O
the base of the phallus and was dark and curled. The
* E/ X+ B) c9 V* \testicular volume was prepubertal at 2 mL each.
& D7 x |2 E3 G8 X& QThe skin was moist and smooth and somewhat
3 J- {4 K8 e1 Hoily. No axillary hair was noted. There were no5 u! D; D' b. E' w
abnormal skin pigmentations or café-au-lait spots. q% v+ i) q9 B
Neurologic evaluation showed deep tendon reflex 2+
7 Q# ^2 A" P, G% Ubilateral and symmetrical. There was no suggestion
5 |5 W4 r6 h: Uof papilledema.3 b8 x+ b6 |5 y9 v, Z, n3 X. o
Laboratory Evaluation8 c1 I& w1 S, T0 y
The bone age was consistent with 28 months by' X0 @3 t5 y& F- |
using the standard of Greulich and Pyle at a chrono-% P* m3 K! V' U9 Q6 H. W
logic age of 16 months (advanced).5 Chromosomal0 b. z' m6 T) t2 v7 l6 a! n. x
karyotype was 46XY. The thyroid function test3 I% G1 ~+ C( u
showed a free T4 of 1.69 ng/dL, and thyroid stimu-: f# F6 v- y& D4 E0 g& n* k5 O8 K, Q
lating hormone level was 1.3 µIU/mL (both normal).( ]9 M( n" t0 z7 W# Y- o) D0 S
The concentrations of serum electrolytes, blood% l2 a, v$ G* W1 o y7 u8 P' P- O
urea nitrogen, creatinine, and calcium all were
8 Q" n% H- }. cwithin normal range for his age. The concentration
7 l; f2 O4 q$ i+ Hof serum 17-hydroxyprogesterone was 16 ng/dL8 b5 S C# Y5 c2 O& a5 U
(normal, 3 to 90 ng/dL), androstenedione was 201 n1 D8 @1 V, L# i9 p$ z6 R$ O
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-/ o: D7 b- w) n' }6 a& ?: h$ |
terone was 38 ng/dL (normal, 50 to 760 ng/dL),( U) z# w* |+ H/ m
desoxycorticosterone was 4.3 ng/dL (normal, 7 to9 K: P1 e. U0 ]. ?/ t9 G- Y/ H
49ng/dL), 11-desoxycortisol (specific compound S) ?- A/ V/ t* p- V* I
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
. d$ n+ a {' q% {tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total( d8 M, f, _0 T
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),& m- Q/ V1 V. Y
and β-human chorionic gonadotropin was less than: L; L* I; r+ C* e( }& j
5 mIU/mL (normal <5 mIU/mL). Serum follicular
/ {: b% P1 A3 astimulating hormone and leuteinizing hormone1 Z4 y+ E$ Z% t
concentrations were less than 0.05 mIU/mL6 M6 e+ ~+ ]5 p$ n
(prepubertal).& K6 Q! w: \7 o) W; ~$ X
The parents were notified about the laboratory
8 V% ]2 J6 `* y& Q3 j. ]0 O @results and were informed that all of the tests were
1 `' k* B6 O; M! \4 K9 Bnormal except the testosterone level was high. The7 `9 r7 z$ W" ?7 Y
follow-up visit was arranged within a few weeks to: \3 U6 L/ ?1 M- `- x
obtain testicular and abdominal sonograms; how-6 `0 w9 x3 A2 d
ever, the family did not return for 4 months.
: ^ O5 \5 p* KPhysical examination at this time revealed that the) T% u3 R; x$ Y
child had grown 2.5 cm in 4 months and had gained- ^( `* p4 u# }2 g: d) q9 X" [
2 kg of weight. Physical examination remained
' j+ p+ |+ f" G3 q9 _unchanged. Surprisingly, the pubic hair almost com-5 ]1 B$ g8 B4 s$ P/ T
pletely disappeared except for a few vellous hairs at3 i( H# L' y1 H& C% L- J1 N, S
the base of the phallus. Testicular volume was still 2+ _+ B; K; f8 f! ~* u
mL, and the size of the penis remained unchanged.
# q0 \' q& R6 u Z: fThe mother also said that the boy was no longer hav-9 B4 [$ n5 |( f% q5 B
ing frequent erections.
) }/ f0 Z% j2 C: d; w) h9 GBoth parents were again questioned about use of
- V1 u3 h* I+ \& `% y! e0 Hany ointment/creams that they may have applied to
2 h# B4 e. ^, Cthe child’s skin. This time the father admitted the, q$ W2 U: {9 d
Topical Testosterone Exposure / Bhowmick et al 541
0 C2 a9 v3 m. j8 Y8 @6 Huse of testosterone gel twice daily that he was apply-3 {) Z, g( r$ z% X# h/ s
ing over his own shoulders, chest, and back area for& a6 _. t0 s9 S
a year. The father also revealed he was embarrassed
9 T, |! G. }' q: e- ]: Sto disclose that he was using a testosterone gel pre-
( s3 C4 `& c% C/ F' p. b" k4 P/ @scribed by his family physician for decreased libido
. p: j/ j+ A* A( i1 Usecondary to depression.! d% e' ~4 {/ ]. s+ v0 ]/ U
The child slept in the same bed with parents.
7 ~) E5 a( J9 Z, b# } M# lThe father would hug the baby and hold him on his7 i2 G4 h) p$ T/ ^0 w
chest for a considerable period of time, causing sig-
$ \6 ]" G+ z2 v4 p! z' b" e' gnificant bare skin contact between baby and father.
7 s$ T& \8 u) m; T% J8 E4 J: nThe father also admitted that after the phone call,3 p7 \: ~0 x( [
when he learned the testosterone level in the baby. n2 W/ B: y- o( n" p @
was high, he then read the product information* x3 h8 n& c! t* o% Z6 ~ H+ l
packet and concluded that it was most likely the rea-
! _% x2 ~+ D2 }/ y( |son for the child’s virilization. At that time, they
# [/ N/ [) C7 k4 Z2 Y& e: Edecided to put the baby in a separate bed, and the
& Y- ?* b) W! R: C% c# [* b4 Y7 Tfather was not hugging him with bare skin and had7 }$ f) x% k% @/ v! S$ B3 {
been using protective clothing. A repeat testosterone
, Y0 X1 B8 b: ^test was ordered, but the family did not go to the: E/ Q" M/ [9 d P2 i
laboratory to obtain the test.1 {9 G/ @( u* t9 x; k' B
Discussion
/ m6 l, ]$ h' k- @# x. KPrecocious puberty in boys is defined as secondary
2 n. H$ }+ t7 L8 D4 h; dsexual development before 9 years of age.1,47 b* C% x. R2 X, Y2 W) [0 F
Precocious puberty is termed as central (true) when4 |9 D% K1 I. x; q+ F
it is caused by the premature activation of hypo-+ b! F4 z0 X+ X4 m$ C. F& g
thalamic pituitary gonadal axis. CPP is more com-+ ?$ N1 g4 N# p/ g7 D0 g O, ?
mon in girls than in boys.1,3 Most boys with CPP
. t' C+ j: @# z; T# Hmay have a central nervous system lesion that is
( h' q Y6 {- N! ?responsible for the early activation of the hypothal-6 _+ N4 ` E: o) c% z' I
amic pituitary gonadal axis.1-3 Thus, greater empha-
+ j1 P! w( Q; ^" ]; @. msis has been given to neuroradiologic imaging in1 p' u6 ~# k( O* U
boys with precocious puberty. In addition to viril-
K1 Q; m2 Y( U% V; h% D5 E0 F* kization, the clinical hallmark of CPP is the symmet-
$ h' X& b0 V7 D" Z- qrical testicular growth secondary to stimulation by y! P: h8 Y: Y8 x$ F! g9 m p9 y6 v# R
gonadotropins.1,3
+ N5 v& W! E; @1 Q: M( G8 L: D! ]) ~Gonadotropin-independent peripheral preco-
! t5 Q6 p+ W# m9 B/ ?! ]cious puberty in boys also results from inappropriate8 m B: |) K, O. |; N7 l
androgenic stimulation from either endogenous or
& a7 Y" u6 F$ Vexogenous sources, nonpituitary gonadotropin stim-
% G( U% \. ^, o4 ~+ E- [7 Q& x9 @. U. Rulation, and rare activating mutations.3 Virilizing
) \8 F* `3 Q5 j3 Jcongenital adrenal hyperplasia producing excessive- S! O+ d8 ]/ y: M
adrenal androgens is a common cause of precocious
! i* i2 ^% M" ]* gpuberty in boys.3,4& W" n! F$ Q* M7 T+ @* c
The most common form of congenital adrenal
% f) A: Q, ~* b. [hyperplasia is the 21-hydroxylase enzyme deficiency.
: Q1 l, d0 H' k) F7 l, J- z q0 fThe 11-β hydroxylase deficiency may also result in, R; G3 Y9 f8 u9 N0 x
excessive adrenal androgen production, and rarely,6 f; V* o) ^6 Q; `0 `
an adrenal tumor may also cause adrenal androgen q/ r# q( C- R6 Q
excess.1,3- N/ w. ]( V+ J- }, h; c2 |
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
+ a9 `9 m4 r* @5 V( S1 s5 U! W542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
& P* t' h4 S) X& RA unique entity of male-limited gonadotropin-
+ B l- U2 x. M' bindependent precocious puberty, which is also known
+ m1 s% Y. V, m3 b. [as testotoxicosis, may cause precocious puberty at a! V. ]# F/ @5 H, P/ C: S
very young age. The physical findings in these boys
+ c& z1 ?3 k U# h1 nwith this disorder are full pubertal development,
* S3 y! j \% n5 ~including bilateral testicular growth, similar to boys& V& `5 z8 ^0 L8 V% O: X7 U
with CPP. The gonadotropin levels in this disorder& F$ b) R, A* w1 Y8 }+ r# ?# d
are suppressed to prepubertal levels and do not show, `. K6 R' }1 k* C
pubertal response of gonadotropin after gonadotropin-% m8 s5 t) m2 Z. A
releasing hormone stimulation. This is a sex-linked4 T0 k/ A L2 Z1 j: d, y/ ^
autosomal dominant disorder that affects only3 {7 W$ U3 {% T2 |; A4 }- |) L
males; therefore, other male members of the family
' l3 m$ s- m2 z# M( N+ qmay have similar precocious puberty.3
9 E: `- F, d$ i! B, T: X/ N0 EIn our patient, physical examination was incon-
) T. j, ^9 _9 c: H( nsistent with true precocious puberty since his testi-5 N6 L5 I# g2 M2 P, Q- a. ^2 H9 `
cles were prepubertal in size. However, testotoxicosis
+ x, o" P. v- C, ?$ V2 Mwas in the differential diagnosis because his father7 s$ u( G* R: |/ M, a& A
started puberty somewhat early, and occasionally,
9 @6 `, Z& a& T ^testicular enlargement is not that evident in the
$ L9 D! v, f! S; r( pbeginning of this process.1 In the absence of a neg-/ ]0 u) S% N' J" u3 I' t8 T
ative initial history of androgen exposure, our% [5 g ~9 O L c! S6 u8 g
biggest concern was virilizing adrenal hyperplasia,
/ V+ y' r: C% Teither 21-hydroxylase deficiency or 11-β hydroxylase
. c i* |7 D8 J: Gdeficiency. Those diagnoses were excluded by find-
" p ?2 w" ~) p. V6 V/ Eing the normal level of adrenal steroids.$ c0 b& M8 z# C& M
The diagnosis of exogenous androgens was strongly8 v$ n$ F6 Z1 u% n6 i, Q, Y
suspected in a follow-up visit after 4 months because
, h) I$ O( m4 `: b5 rthe physical examination revealed the complete disap-
. i2 o! C( A0 x- E: d. Z% dpearance of pubic hair, normal growth velocity, and3 }& @# u: I6 M1 c/ Q
decreased erections. The father admitted using a testos- Z; F8 d" {# e- z
terone gel, which he concealed at first visit. He was& e0 r6 ?# ^! [& ^- I
using it rather frequently, twice a day. The Physicians’
5 }' ~# b. r, r6 V8 n7 IDesk Reference, or package insert of this product, gel or
- t5 n9 Z+ @8 V2 U( S5 U! Mcream, cautions about dermal testosterone transfer to9 l8 B' v0 ~: u' y
unprotected females through direct skin exposure.
, b4 ]7 w/ F" S- |Serum testosterone level was found to be 2 times the
8 u- H! I# N7 X- W* r. E* tbaseline value in those females who were exposed to
Y2 S7 c( n8 l }8 Ceven 15 minutes of direct skin contact with their male% h- ], q @( L/ _
partners.6 However, when a shirt covered the applica-* T I8 Q8 P; {% ?4 c
tion site, this testosterone transfer was prevented.3 P. U* {1 R7 s9 g- T2 r
Our patient’s testosterone level was 60 ng/mL,
+ E+ e E, j) ]0 C% K9 E2 fwhich was clearly high. Some studies suggest that
/ X4 p8 A2 y! W$ U) fdermal conversion of testosterone to dihydrotestos-, L' l8 q7 j1 r5 f
terone, which is a more potent metabolite, is more
# h5 K* X6 X) T) t( Lactive in young children exposed to testosterone7 Y- T, W% \# d* B. e5 Z
exogenously7; however, we did not measure a dihy-
" z5 U" V% f9 e+ w5 Kdrotestosterone level in our patient. In addition to
% r+ r/ x7 P; } I, l X. i! p, S# xvirilization, exposure to exogenous testosterone in7 {) d- t7 f( Q( P7 M0 Y( F7 M
children results in an increase in growth velocity and4 t) Q6 `* s9 S; A
advanced bone age, as seen in our patient.
7 o& F z1 i) v: F) \3 @" r6 zThe long-term effect of androgen exposure during& Y. i- S$ @5 Q1 o) _
early childhood on pubertal development and final; y% a! k- s9 p1 z+ Y: F& z( a
adult height are not fully known and always remain
$ A' T9 p7 a- n. aa concern. Children treated with short-term testos-
3 Z, i3 W8 Y6 d3 T) a2 h* Lterone injection or topical androgen may exhibit some
+ W) w/ [ [7 I8 |acceleration of the skeletal maturation; however, after% o) ~5 l$ R- h+ Y5 t4 V+ j' ~! t& J
cessation of treatment, the rate of bone maturation3 A0 K% Q1 m$ ^3 J' b# Z
decelerates and gradually returns to normal.8,98 w/ k& a8 z0 |5 z _+ ~
There are conflicting reports and controversy2 B; r" f+ W1 b# `( I$ b- m
over the effect of early androgen exposure on adult
& j" U( T+ W( X5 spenile length.10,11 Some reports suggest subnormal1 I4 k' `# E# Q- D$ o4 @% }- C
adult penile length, apparently because of downreg-2 ?2 ]3 T( j0 p
ulation of androgen receptor number.10,12 However,0 V2 ]' B, E) \) F
Sutherland et al13 did not find a correlation between
+ V4 Z, v/ P( P$ ~childhood testosterone exposure and reduced adult
: t6 h+ J8 s- E- \penile length in clinical studies.
) n a' c1 J3 q8 C0 ?2 SNonetheless, we do not believe our patient is. A/ [- p$ F1 c& z, V8 b
going to experience any of the untoward effects from* b4 w3 E" ?$ c6 ^ P; ]
testosterone exposure as mentioned earlier because
! A; d# I2 j+ S5 t; N. Uthe exposure was not for a prolonged period of time.6 B! x' {7 F2 Z5 Y5 _+ ]
Although the bone age was advanced at the time of H# O. r' F \' c: ]; \1 f I
diagnosis, the child had a normal growth velocity at
: g9 E+ O: B, W6 Hthe follow-up visit. It is hoped that his final adult) T5 E' A |, ?6 g) B7 Q
height will not be affected.- C, W7 G- d' H" `$ i7 R
Although rarely reported, the widespread avail-0 r! r" E8 V, y3 D
ability of androgen products in our society may
& K- Q; ?* \1 f. S- q) h& ^indeed cause more virilization in male or female
1 K( i2 s% H- s2 ychildren than one would realize. Exposure to andro-" c7 O# v5 K4 A* N) K) }. E
gen products must be considered and specific ques-
* @( `0 Y1 O$ Y Ytioning about the use of a testosterone product or. `( B. |; [8 |$ z
gel should be asked of the family members during
2 U! c4 t8 f9 D$ `the evaluation of any children who present with vir-- A& _0 g6 z9 P; A9 B
ilization or peripheral precocious puberty. The diag-9 |7 p3 u- @+ ^1 ]( f% D
nosis can be established by just a few tests and by f# n6 S8 k# o' K5 l+ U, D- Y8 N
appropriate history. The inability to obtain such a
9 f' @0 G6 H' G% thistory, or failure to ask the specific questions, may
) I# @" i4 m" m7 l% L2 ^+ Bresult in extensive, unnecessary, and expensive- N" [1 p" l4 Z! c+ G
investigation. The primary care physician should be p; n8 F! J) _& S0 P& B8 S/ C
aware of this fact, because most of these children
% @" S6 O5 c/ I7 V. d5 }may initially present in their practice. The Physicians’
& X6 H' z g) z( ]Desk Reference and package insert should also put a U( G$ c& O0 I
warning about the virilizing effect on a male or
; y% t8 [) z9 B! a0 H/ ffemale child who might come in contact with some-
1 _% k0 H6 |6 `3 y, n6 h6 ione using any of these products.5 l$ N; }; t" V
References
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Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
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2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious& r2 f" k) W. j7 T3 O6 J
puberty in children with tumours of the suprasellar pineal
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6 W0 R0 f% h( U" i0 i8 jexposure to testosterone. Pediatrics. 1999;104:e23.. T6 a- u* e$ R# ]3 [' @, H' M$ g" }
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Stanford, CA: Stanford University Press; 1959.. B1 r1 x. G& p9 d8 t& O0 h
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; M( O$ q# C& {$ ]Economics Company, Inc; 2004:3239-3241.4 m0 B/ Y" K) q6 C: X# r8 d
7. Klugo RC, Cerny JC. Response of micropenis to topical( q2 b5 P# m- E' x6 y! B- v7 ?6 h R
testosterone and gonadotropin. J Urol. 1978;119:/ |4 n4 r7 t% I5 e; x e' p
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