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is a significant concern for physicians. Central+ U0 `' c& v* U2 g
precocious puberty (CPP), which is mediated3 e! _: I0 c) B& e% n2 y5 k
through the hypothalamic pituitary gonadal axis, has
% U3 k2 n. J' n6 \a higher incidence of organic central nervous system: G0 C [* J! v$ i& w
lesions in boys.1,2 Virilization in boys, as manifested8 }& w R* F: q0 o2 i
by enlargement of the penis, development of pubic/ S/ E; z9 ~6 G0 z0 b) ~
hair, and facial acne without enlargement of testi-
: ?' X: @+ @7 f7 g3 I0 ?# s9 l$ Vcles, suggests peripheral or pseudopuberty.1-3 We
. a" z# D9 ~, V! h, H2 q6 L2 |report a 16-month-old boy who presented with the: w2 F+ H, a( N- b
enlargement of the phallus and pubic hair develop-2 O. h ` |" Z: @7 P
ment without testicular enlargement, which was due; Z% E& o' h* Z( U' [' c
to the unintentional exposure to androgen gel used by
7 V" Q" T& D. l6 q) i: Y# z2 i7 Wthe father. The family initially concealed this infor-
l9 ~) O" @- J D' [mation, resulting in an extensive work-up for this1 o! @6 e ?9 }
child. Given the widespread and easy availability of, H# `/ o! ~+ Z5 k
testosterone gel and cream, we believe this is proba-3 a. t0 y- T9 _2 U8 X/ \3 D
bly more common than the rare case report in the: d- w6 ]8 b+ K( ^& Z3 k
literature.4
7 s8 q& c6 k; ~5 D% D1 vPatient Report
; |5 f5 ~) G, W) LA 16-month-old white child was referred to the
0 C7 {7 ^9 n x3 d! F3 yendocrine clinic by his pediatrician with the concern. P. `9 W4 j$ h; g8 u
of early sexual development. His mother noticed
3 Q4 ]3 _1 G3 v' M! jlight colored pubic hair development when he was9 D8 k& S# r( n! Z9 V0 _
From the 1Division of Pediatric Endocrinology, 2University of' E; v- Q9 T- a! g9 f9 `
South Alabama Medical Center, Mobile, Alabama.; F3 ^0 z$ ^7 I- N2 p8 J
Address correspondence to: Samar K. Bhowmick, MD, FACE,
! { c: S5 _$ _. s5 a% kProfessor of Pediatrics, University of South Alabama, College of7 c, C. X, _ v; a
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
3 t0 N: ^) Z/ K' U8 a. f7 S+ D4 @e-mail: [email protected].: y. ]8 _: I w* M2 G' n t
about 6 to 7 months old, which progressively became
$ j) ]) w% E! C( P( m9 \darker. She was also concerned about the enlarge-
9 a7 c( O& m* z0 D+ u) Kment of his penis and frequent erections. The child5 n- a( [' B7 s; }6 n4 r
was the product of a full-term normal delivery, with
3 ]1 {" C9 j! _4 K! o& ^ ~a birth weight of 7 lb 14 oz, and birth length of" k" [9 H! h, d4 B
20 inches. He was breast-fed throughout the first year
6 E. i- C) v e& |" Cof life and was still receiving breast milk along with
5 ~% t( j" I' X1 [/ D( K$ N( e# _solid food. He had no hospitalizations or surgery,4 ~. b. p$ i0 m" q( y& r; e
and his psychosocial and psychomotor development
# _7 U6 m; C" H: W0 [' }; U/ Twas age appropriate.
/ c; h8 @4 J. o+ L7 r) hThe family history was remarkable for the father," O8 N: U( V# c$ J) Q/ i4 r. D* H9 q
who was diagnosed with hypothyroidism at age 16,6 F! x, e. ?- u$ ^( N
which was treated with thyroxine. The father’s
! h4 ?: r' V5 J5 I- ~ ^+ O0 q: s* Zheight was 6 feet, and he went through a somewhat3 x$ x6 d. n- {- ^. L. r
early puberty and had stopped growing by age 14.
( X& D( S1 T, r V' {% q8 aThe father denied taking any other medication. The6 b/ _& @( \1 t! h
child’s mother was in good health. Her menarche
5 k; L: b) S) |# p6 a% ?& i9 Ywas at 11 years of age, and her height was at 5 feet
% f# B* u/ b3 h5 k/ U9 n. {, M. }5 inches. There was no other family history of pre-6 P# l8 O4 h) a. T# d7 E# z0 G
cocious sexual development in the first-degree rela-
& ~" V+ A: D* w: z, K: D7 Vtives. There were no siblings.4 b2 Q I' J# t7 n
Physical Examination$ D( w+ A$ z( R5 d" Q3 \# X
The physical examination revealed a very active,% I: ]* `* h/ H9 E( L2 i
playful, and healthy boy. The vital signs documented/ [' ]4 ]7 o/ V( f, s$ W4 r: `8 w8 C
a blood pressure of 85/50 mm Hg, his length was
. k+ `8 f4 X2 q! Z% ~% J' O+ [90 cm (>97th percentile), and his weight was 14.4 kg
' y+ [9 ~+ m5 P. f: B7 J(also >97th percentile). The observed yearly growth. o: N! C+ s g; [( K8 U
velocity was 30 cm (12 inches). The examination of
& M! V& ^( t( W' N9 Dthe neck revealed no thyroid enlargement.
& l$ B1 z* ^5 oThe genitourinary examination was remarkable for
# I! {5 O/ H' M& e) x" kenlargement of the penis, with a stretched length of
6 P$ Y/ w* d. ~' M+ T: L8 cm and a width of 2 cm. The glans penis was very well
7 l* [ M0 @2 g+ Ddeveloped. The pubic hair was Tanner II, mostly around
1 l5 Q4 ]" C( S540
^# @: z8 l: W% v/ Y0 X) G7 Z7 L5 Yat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from7 a7 T9 A: _0 v, ]
the base of the phallus and was dark and curled. The
/ T. o1 F4 ^& U% ]testicular volume was prepubertal at 2 mL each.
, j% @9 e1 g) t% G- R1 tThe skin was moist and smooth and somewhat
6 z7 D( H, P3 toily. No axillary hair was noted. There were no. [9 A8 B! w! J2 y0 ~+ s
abnormal skin pigmentations or café-au-lait spots.
+ s5 J* X% T, n7 Y$ vNeurologic evaluation showed deep tendon reflex 2+: g7 T. i- b! y
bilateral and symmetrical. There was no suggestion
: ^9 e4 ?# D: U0 B) |8 O, C0 Tof papilledema.
( e( v% [/ G5 }8 wLaboratory Evaluation
: D7 B+ s f8 P' v& w; _The bone age was consistent with 28 months by
& u2 J8 h. n7 tusing the standard of Greulich and Pyle at a chrono-
( S0 y6 ~- ~. j# d( Slogic age of 16 months (advanced).5 Chromosomal
9 \/ r9 ~4 {3 R0 p8 ~0 s2 Ikaryotype was 46XY. The thyroid function test
- |* ^* F4 ~4 j% Lshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
3 t) o9 g7 c/ w3 `2 Glating hormone level was 1.3 µIU/mL (both normal).2 [0 h& z2 ~8 X1 C8 {# e5 ?5 G( [
The concentrations of serum electrolytes, blood% N9 _0 L* ~1 }5 e9 v) T
urea nitrogen, creatinine, and calcium all were4 h1 K; c0 ^5 {2 O
within normal range for his age. The concentration+ N8 ^9 A2 B1 q$ |. }7 V1 E* ~
of serum 17-hydroxyprogesterone was 16 ng/dL7 o6 [8 ]6 o1 t( A$ H6 E2 a
(normal, 3 to 90 ng/dL), androstenedione was 20
! T1 {4 T4 B( }, k* t2 @ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
. {$ q+ ?! G, K y; d: Pterone was 38 ng/dL (normal, 50 to 760 ng/dL),
* A$ _2 s- t) f% j; Y' L) |5 ]2 Idesoxycorticosterone was 4.3 ng/dL (normal, 7 to0 f* O! D7 t4 A% [# t- @7 Q
49ng/dL), 11-desoxycortisol (specific compound S)
2 q0 m# C# v& F9 } Owas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-5 b8 O! s$ E* Z) r |8 R
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
/ G0 K, O) I; Y8 Gtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),2 @# P* F$ P4 D' w' O! J5 T- T
and β-human chorionic gonadotropin was less than
, ~; H% T1 s" t5 mIU/mL (normal <5 mIU/mL). Serum follicular' P' M$ K# k8 U5 @& r, V" {
stimulating hormone and leuteinizing hormone% ?" d: t% ~* o% d. c' ?
concentrations were less than 0.05 mIU/mL) I7 Q* a8 }( S' f G+ I
(prepubertal).5 [' ~( Z, p% V! `2 k. I
The parents were notified about the laboratory
2 O( U: X8 K# cresults and were informed that all of the tests were
2 z3 ]# i/ k A% J" `# anormal except the testosterone level was high. The
# P) @9 `4 r7 _8 ?: Y/ t# Q. c/ @follow-up visit was arranged within a few weeks to3 `$ g- T9 y, E& ^2 h+ T
obtain testicular and abdominal sonograms; how-4 f& ^4 A" ]- F
ever, the family did not return for 4 months.5 y$ w8 v" i9 }6 w3 n
Physical examination at this time revealed that the
7 n4 b D" Z' Y( w$ _child had grown 2.5 cm in 4 months and had gained( a# e. T2 n1 U, S2 S5 U
2 kg of weight. Physical examination remained0 [ f2 ~+ C$ y3 v) V+ n
unchanged. Surprisingly, the pubic hair almost com-. h. j& R8 Y; }- f
pletely disappeared except for a few vellous hairs at
0 [; C0 j. J* a) c Cthe base of the phallus. Testicular volume was still 2+ n( q# X- R6 z; B/ y
mL, and the size of the penis remained unchanged.
( ?5 C( ^6 ^7 l; TThe mother also said that the boy was no longer hav-6 ]5 a8 ^( {; G9 ^: j l- F
ing frequent erections./ X, `4 V$ n! Q9 u2 N
Both parents were again questioned about use of
% H0 G& J! K" \) c. H2 kany ointment/creams that they may have applied to) |- E1 {, O; N9 h
the child’s skin. This time the father admitted the
# w7 }7 t8 R! x' m/ a0 f) rTopical Testosterone Exposure / Bhowmick et al 541& f5 W: @3 r) y9 i0 ~
use of testosterone gel twice daily that he was apply-
1 \6 G+ o( b; Q/ Z. F ving over his own shoulders, chest, and back area for
, n, s& J) z+ C1 f8 |a year. The father also revealed he was embarrassed
3 D. Z% s! Z! oto disclose that he was using a testosterone gel pre-
t2 \+ q8 U% F& _9 P9 tscribed by his family physician for decreased libido7 n, Q' q0 w0 p1 E/ A
secondary to depression.6 m- J: a/ m8 ]+ v, V3 e5 Q
The child slept in the same bed with parents.
, g0 P3 _, ]3 d# [The father would hug the baby and hold him on his9 P' U" l7 n5 v, \" A8 P3 ^- M
chest for a considerable period of time, causing sig-/ |3 @$ x* b, R2 E" k5 F
nificant bare skin contact between baby and father.
4 e' r- c% v: m3 ZThe father also admitted that after the phone call,
" Y$ L+ J, G" |. ^( d3 u0 jwhen he learned the testosterone level in the baby
$ S; P% N7 W, P# }, C. Q3 H8 k- ^& Ewas high, he then read the product information
! W6 F4 X0 l0 T( E: f8 V+ [, spacket and concluded that it was most likely the rea-% [! F3 a# I# Y& l2 M8 {3 O
son for the child’s virilization. At that time, they
) G0 k- e; a. C- A6 j9 t5 Jdecided to put the baby in a separate bed, and the! S1 B/ b: v! T" q8 C
father was not hugging him with bare skin and had
/ }. E) A0 q1 f% r- E ]2 f4 D3 Z1 P: ebeen using protective clothing. A repeat testosterone" V }* X. F4 R" E, D6 V- r
test was ordered, but the family did not go to the% J1 J6 G/ ~, |7 H1 f
laboratory to obtain the test.3 E* E3 U& X9 E( k# Z
Discussion
( L: G! z' R- O# `: o: y) h8 m5 ?Precocious puberty in boys is defined as secondary' r! q2 U) N: U; u" x. v
sexual development before 9 years of age.1,4
. I8 J9 e3 Y& U$ B6 ^Precocious puberty is termed as central (true) when: P) X3 J( h2 T# u3 I: v
it is caused by the premature activation of hypo-
6 x9 ^0 i+ d4 J9 Kthalamic pituitary gonadal axis. CPP is more com-6 c6 d; J3 C: S$ c) p( C) M2 n# ?
mon in girls than in boys.1,3 Most boys with CPP4 l1 _3 K t+ y' r, A8 ?, N8 Q
may have a central nervous system lesion that is# c9 e$ f( b! _; r) A6 u6 K5 D. X3 N
responsible for the early activation of the hypothal-
2 x, {& X6 ^( ~amic pituitary gonadal axis.1-3 Thus, greater empha-% j: G: q) b; U7 K
sis has been given to neuroradiologic imaging in- f" O" O7 k; I8 c+ e0 o; G
boys with precocious puberty. In addition to viril-
! @8 n6 r% g8 ]3 D: q- Tization, the clinical hallmark of CPP is the symmet-
+ I0 Z/ i6 x: N6 Q/ _rical testicular growth secondary to stimulation by. o4 E- K ?# ~" ~
gonadotropins.1,3 n6 u1 s3 \: T h/ F% n: n
Gonadotropin-independent peripheral preco-4 W6 o* Z' @) D
cious puberty in boys also results from inappropriate
4 [0 M6 A3 _) g1 H7 x, handrogenic stimulation from either endogenous or. q/ a, E% d) S& \+ k# Q, H
exogenous sources, nonpituitary gonadotropin stim-
0 f, j9 _- q$ t4 Fulation, and rare activating mutations.3 Virilizing
( G8 h6 K, U9 H& w# Y- Econgenital adrenal hyperplasia producing excessive E) Z% S. _, S
adrenal androgens is a common cause of precocious* f; _- ?! m" R( F$ z: y
puberty in boys.3,4
8 q, T8 h# H* f( b/ u2 eThe most common form of congenital adrenal- J7 P$ e3 {. G" C8 }- f, L2 J& _
hyperplasia is the 21-hydroxylase enzyme deficiency.) l, X" h! d. j- n, ]
The 11-β hydroxylase deficiency may also result in
; Z) b7 _& {. J6 z$ [excessive adrenal androgen production, and rarely,
7 d8 z9 D4 s L( p% Xan adrenal tumor may also cause adrenal androgen
: m: L# g! Q6 L$ _excess.1,3
5 f$ X* S% E) |" R, M' y3 Rat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
0 t4 E8 f7 T |542 Clinical Pediatrics / Vol. 46, No. 6, July 2007 s4 L2 o3 ~5 E9 i
A unique entity of male-limited gonadotropin-0 P& q* f1 t8 ^7 e# _0 F
independent precocious puberty, which is also known
' Z2 y( x. `2 V, Yas testotoxicosis, may cause precocious puberty at a, M( s$ f. K$ t* d6 j& u3 q! ~
very young age. The physical findings in these boys# h" V- m4 p- g$ _& H
with this disorder are full pubertal development,
4 y. ]: d) j+ s4 K. Cincluding bilateral testicular growth, similar to boys2 \) ?) ]' i: ~/ m9 t R7 A8 o
with CPP. The gonadotropin levels in this disorder
/ O' m7 d; P6 _' Z) z7 R7 }) u9 uare suppressed to prepubertal levels and do not show
! T* |' v( X( c) v( l" epubertal response of gonadotropin after gonadotropin-
6 @9 s% a* x% W! G3 Rreleasing hormone stimulation. This is a sex-linked
& z' n s7 a* V$ V V; Eautosomal dominant disorder that affects only
$ I$ {- p: d: E! t4 mmales; therefore, other male members of the family, N; a4 q; U# A: x* L" L, x, e
may have similar precocious puberty.3
! ~6 Y4 B0 g( }; x* m2 k- kIn our patient, physical examination was incon-/ q& v0 N& t$ V
sistent with true precocious puberty since his testi-
; v9 a* L+ \4 U, p9 ycles were prepubertal in size. However, testotoxicosis
- \, X$ Z, N. A& }3 [6 U1 Bwas in the differential diagnosis because his father
; x% t& J) d3 }) V$ Nstarted puberty somewhat early, and occasionally,$ |* I* a# o) c& ~# L
testicular enlargement is not that evident in the( D" T( `0 B! H5 a$ D: G" C
beginning of this process.1 In the absence of a neg-. d: o5 L( V: B9 ~5 r
ative initial history of androgen exposure, our
! h$ F, C1 }; p5 N3 o5 vbiggest concern was virilizing adrenal hyperplasia,
* m/ p% J# p8 I& }) [either 21-hydroxylase deficiency or 11-β hydroxylase% M# u2 V0 \& {+ r
deficiency. Those diagnoses were excluded by find-4 ? i8 _ X6 L/ N1 e& o, u4 ]
ing the normal level of adrenal steroids.
8 Z) n$ J0 }. q1 j% yThe diagnosis of exogenous androgens was strongly
8 l% f) C/ j7 T9 M0 @4 I! g$ msuspected in a follow-up visit after 4 months because
3 O* U0 m- A" }0 I/ y% c( Athe physical examination revealed the complete disap-
" x% }" `$ V; ?2 ~' H( ]pearance of pubic hair, normal growth velocity, and: t3 I. v* R$ a
decreased erections. The father admitted using a testos-8 ~% B) g. r9 t0 l
terone gel, which he concealed at first visit. He was
. A$ B' ~% F( ]; b' dusing it rather frequently, twice a day. The Physicians’
/ E7 t a) q, J- q$ _* G9 ^Desk Reference, or package insert of this product, gel or
. ` w% w, M2 jcream, cautions about dermal testosterone transfer to
7 ^# I! o$ Y7 V4 Q/ Q: nunprotected females through direct skin exposure.
- r7 y. O- G% \9 B1 |Serum testosterone level was found to be 2 times the ]4 u' X( \# O0 e0 f) I7 }$ w
baseline value in those females who were exposed to; D/ e `+ ^8 C% q8 p
even 15 minutes of direct skin contact with their male
2 q' y% I. A0 v* n' ^0 Cpartners.6 However, when a shirt covered the applica-; Q& i9 Z- ?3 }# Q0 m9 N
tion site, this testosterone transfer was prevented.
, Q* Q" A/ u6 i t8 kOur patient’s testosterone level was 60 ng/mL,
9 [5 a: f, x3 N; s" m/ v+ v* \which was clearly high. Some studies suggest that
" L$ S9 I1 i6 tdermal conversion of testosterone to dihydrotestos-
/ ^: S4 F* Z8 i. V5 U; w R. @terone, which is a more potent metabolite, is more7 u, X: P% D9 W3 X
active in young children exposed to testosterone7 _0 J) Q# W; F
exogenously7; however, we did not measure a dihy-, v! y$ @0 b/ K4 }( O4 d5 @
drotestosterone level in our patient. In addition to% y, t! B, ?% e2 J8 m
virilization, exposure to exogenous testosterone in* N" r" O' m l$ ?6 `, I
children results in an increase in growth velocity and
+ Q0 r5 Z: I5 D0 A: u4 Z; @advanced bone age, as seen in our patient.7 r7 ]0 M. r6 |) c' O- T
The long-term effect of androgen exposure during$ G) G/ f6 a( B& ~
early childhood on pubertal development and final
# Z9 \: Q9 Z% \6 Radult height are not fully known and always remain
8 g7 `; c0 O" h# P4 g8 t. N: Xa concern. Children treated with short-term testos-
/ j2 T( L/ S* V4 Xterone injection or topical androgen may exhibit some
8 w. F6 ^- F8 q2 ?2 ^0 tacceleration of the skeletal maturation; however, after
( Y* h* a. N7 @. }, H7 x }' Ocessation of treatment, the rate of bone maturation
; P7 T m5 {% p |decelerates and gradually returns to normal.8,9
4 L# e# @& m1 r# F& r, Q; fThere are conflicting reports and controversy
% Z# y8 G; i; P3 E& gover the effect of early androgen exposure on adult
& ^1 M- m, _+ Ypenile length.10,11 Some reports suggest subnormal
! B! J+ n0 S7 b8 q$ z- g! {adult penile length, apparently because of downreg-
5 w& ]1 u G7 j3 C* mulation of androgen receptor number.10,12 However,
2 K- m) z, U6 b& Z" v$ N7 S& ZSutherland et al13 did not find a correlation between
3 y. n2 P" c7 G$ _ [& @) Rchildhood testosterone exposure and reduced adult* W p- B" F- ^; p' G
penile length in clinical studies.
9 |8 d" U5 I5 Q6 I' YNonetheless, we do not believe our patient is
: b" Z% R. f& L* x. ggoing to experience any of the untoward effects from# B& O5 V/ y* q# ~. S, D
testosterone exposure as mentioned earlier because
) u: L" g+ ?3 C9 s. uthe exposure was not for a prolonged period of time.
) q% `! J" n* g: Y$ rAlthough the bone age was advanced at the time of
- v* {7 U4 X2 a7 \; h% B- u8 C6 Zdiagnosis, the child had a normal growth velocity at! a& F5 _9 x/ x; b1 {7 L4 x" v
the follow-up visit. It is hoped that his final adult" e9 G A% k/ Q) _% D' P
height will not be affected.) c; y4 N/ D W6 X; X4 Y4 `
Although rarely reported, the widespread avail-
1 C% a I2 @; L. e6 I! `6 ?ability of androgen products in our society may
, I, j3 x2 Q' U, f1 ?; o% Q" Cindeed cause more virilization in male or female
7 H4 ~- z% p/ R! W* G, Y8 [/ [$ q: k8 B' hchildren than one would realize. Exposure to andro-! b1 V8 @# @$ _( G. J9 T
gen products must be considered and specific ques-
1 @- D8 R- A1 v0 z* g5 Z+ W; w* U ztioning about the use of a testosterone product or. i; c/ e) w p6 Z) I
gel should be asked of the family members during
# \$ ~- B8 K, f( K9 C" Ithe evaluation of any children who present with vir-
- k6 m. t2 p) z% D! Oilization or peripheral precocious puberty. The diag-1 u( q' @0 G; G, V
nosis can be established by just a few tests and by+ b* `+ Z+ v6 k
appropriate history. The inability to obtain such a
0 u( l; K6 e9 W! A, Z" g6 t! G* `history, or failure to ask the specific questions, may
& F0 U$ r& h! o; G; n7 Zresult in extensive, unnecessary, and expensive. A; G" W' O3 b( c3 w/ R/ b
investigation. The primary care physician should be
1 [5 K& W) m3 V. M; e9 V& ^aware of this fact, because most of these children! t0 w- q. k% t& ^" p5 b! h
may initially present in their practice. The Physicians’
7 Y- M% e! ^# F9 ?1 o" CDesk Reference and package insert should also put a6 b9 Q3 O/ _: P& v0 H8 q
warning about the virilizing effect on a male or
( i3 m5 i1 m1 p$ rfemale child who might come in contact with some-
5 j" G6 l, G8 mone using any of these products.6 X# B; R2 L" C2 x0 \% w4 k
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! p/ Y# Z4 `+ J }! `7. Klugo RC, Cerny JC. Response of micropenis to topical
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