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is a significant concern for physicians. Central
! W H3 e5 n* f8 Q. Y# Wprecocious puberty (CPP), which is mediated
. Z% J9 L6 K8 n: n/ `through the hypothalamic pituitary gonadal axis, has( K* R5 d1 k0 [! H7 V
a higher incidence of organic central nervous system
1 Z h+ i: q- W+ Slesions in boys.1,2 Virilization in boys, as manifested1 I4 m7 ~& }4 B+ C4 z( |: P5 R
by enlargement of the penis, development of pubic
f! K) ]1 h- V! Ehair, and facial acne without enlargement of testi- V) R2 s) z! p6 k ]4 r. _
cles, suggests peripheral or pseudopuberty.1-3 We6 N6 Y% [ ]& ?0 X
report a 16-month-old boy who presented with the: a6 Q' x5 W8 H2 ~/ i
enlargement of the phallus and pubic hair develop-
0 ^- e% R; C1 P! u$ ^/ ument without testicular enlargement, which was due
4 A1 a7 }7 q u3 @to the unintentional exposure to androgen gel used by8 u" }" N1 L' C/ t9 I' f" C0 V6 N
the father. The family initially concealed this infor-8 I& B# L) s: c6 k; p
mation, resulting in an extensive work-up for this
8 B& C/ L. b5 s) q. i2 Y M" t) Jchild. Given the widespread and easy availability of
. e, S; q% e/ d B2 _testosterone gel and cream, we believe this is proba-
/ ~4 c; N) A1 b; E- _2 nbly more common than the rare case report in the9 l5 ] b' o# l$ l+ }3 t
literature.4
1 J. s6 _- X" Y1 B. B$ ~9 rPatient Report( G( y9 u/ B! t; C @" O7 |5 {
A 16-month-old white child was referred to the
$ n8 O l: ]$ U9 @endocrine clinic by his pediatrician with the concern ` z% j+ H0 ^! w
of early sexual development. His mother noticed$ M/ N' s4 Q0 D7 C
light colored pubic hair development when he was( `1 r7 x q3 E v- P; x0 V
From the 1Division of Pediatric Endocrinology, 2University of
, t8 }! n4 S% f) e: _; ISouth Alabama Medical Center, Mobile, Alabama.% ^: \) J3 }% w1 E1 A
Address correspondence to: Samar K. Bhowmick, MD, FACE,
( b# N2 c; x* U; `Professor of Pediatrics, University of South Alabama, College of. V |9 ^* h$ P4 J( a1 i$ Z t6 s" F
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
. M" ~7 Z; `/ Ke-mail: [email protected].
' h8 ?3 m1 h3 \ e% N; Y' Cabout 6 to 7 months old, which progressively became
: S5 N3 e; |% v% j. Cdarker. She was also concerned about the enlarge-1 y3 P7 y. }8 s5 q* t2 x+ w% M
ment of his penis and frequent erections. The child
. J4 h. [( Z6 d9 e: d2 J! ~was the product of a full-term normal delivery, with# N4 I3 g" `5 p9 [; z1 P. L
a birth weight of 7 lb 14 oz, and birth length of3 f# {) v1 n0 _$ Q% W, o8 Z
20 inches. He was breast-fed throughout the first year" G0 }. [% `& t8 }- ?6 J
of life and was still receiving breast milk along with
0 H( y2 Q9 \" Y0 P% n) q" |' O- @solid food. He had no hospitalizations or surgery,
9 u* S K( R' v; U% x6 Iand his psychosocial and psychomotor development( S' t1 V; p+ t' l C
was age appropriate.
& C' I8 U$ F, w& K) nThe family history was remarkable for the father,
, t5 |, N+ K- {, ?4 U, vwho was diagnosed with hypothyroidism at age 16,& E0 C$ d3 d7 G, x+ W# Y$ h, d( }
which was treated with thyroxine. The father’s
5 h! P( {! X2 kheight was 6 feet, and he went through a somewhat
% Y" R1 c; O( yearly puberty and had stopped growing by age 14.
* j- u0 e: Z/ j9 fThe father denied taking any other medication. The1 W5 T3 D" O" N8 T/ B; s( O* K* P9 t% ]
child’s mother was in good health. Her menarche
Z3 d5 F' q; d# w& q# Dwas at 11 years of age, and her height was at 5 feet
& ^: y7 h3 }% n5 U5 inches. There was no other family history of pre-9 C) ? ^( |0 B' i8 [! v( r
cocious sexual development in the first-degree rela-& X( l; y9 N3 v9 t/ d9 H. S
tives. There were no siblings.) O/ Q8 ^& M1 `6 T
Physical Examination* B3 S. j! N' o' w2 t1 l9 R( X* @
The physical examination revealed a very active,
8 ^. {8 ^! h0 K2 a i; [. kplayful, and healthy boy. The vital signs documented$ Q) a. ?& S" s* I5 M# V( i
a blood pressure of 85/50 mm Hg, his length was8 X" c0 u0 |9 y: u
90 cm (>97th percentile), and his weight was 14.4 kg8 h- c3 V, a* y4 O2 o8 [
(also >97th percentile). The observed yearly growth
/ S2 G, a7 y* S/ L8 Svelocity was 30 cm (12 inches). The examination of
) k' Y+ z% D f8 jthe neck revealed no thyroid enlargement.6 M9 o. R: N% ~& K4 ~' W
The genitourinary examination was remarkable for, s R( m1 N% D" r- T* y
enlargement of the penis, with a stretched length of
; x- z; U* T. o1 `# n j8 cm and a width of 2 cm. The glans penis was very well3 S4 ?, H; w5 l8 H
developed. The pubic hair was Tanner II, mostly around
8 D7 L7 j9 j# r6 R540
# `4 I( _4 }$ I; E5 o3 yat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
! W% C2 I F1 ]" a# y. f$ R& m' rthe base of the phallus and was dark and curled. The
9 A- |, ^9 a) a$ T7 ~- ?* i: Ztesticular volume was prepubertal at 2 mL each.: t7 b" ?* U6 i/ c& [+ |' ]
The skin was moist and smooth and somewhat7 W8 k5 z. I7 O. H; i8 g
oily. No axillary hair was noted. There were no
, k1 i! P; i( Jabnormal skin pigmentations or café-au-lait spots.4 y/ R0 y3 ^$ T! M1 q. k9 ~
Neurologic evaluation showed deep tendon reflex 2+8 i7 p& n& ~; ]. K! M% q
bilateral and symmetrical. There was no suggestion8 f+ c7 q; Q9 X
of papilledema.2 r% E/ R1 n8 z! ?- X
Laboratory Evaluation
, \$ ^! o- `$ M- e9 mThe bone age was consistent with 28 months by
6 \+ O4 l: o& h2 s% s1 Ausing the standard of Greulich and Pyle at a chrono-
$ |7 k9 T+ @0 Vlogic age of 16 months (advanced).5 Chromosomal
]: P* x) U" a( Tkaryotype was 46XY. The thyroid function test, x7 z0 v" v; m9 f- `
showed a free T4 of 1.69 ng/dL, and thyroid stimu-) I; L* M8 ~' B) F5 }6 l& r
lating hormone level was 1.3 µIU/mL (both normal).
! a6 ]+ n: K# C+ z6 e9 ]! h$ GThe concentrations of serum electrolytes, blood. \. X6 G- [6 K0 v0 E& x
urea nitrogen, creatinine, and calcium all were: v$ ^2 N! @1 ?
within normal range for his age. The concentration" k, f1 u) K5 b: u
of serum 17-hydroxyprogesterone was 16 ng/dL
6 ]& U! \! i+ c* Q M( M(normal, 3 to 90 ng/dL), androstenedione was 20. Q- a" v% k9 Y4 G
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
2 M# y4 N: X, {( L" O5 w: P5 cterone was 38 ng/dL (normal, 50 to 760 ng/dL),
4 z S. _ T) wdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
0 M% O; i/ C7 F) E' D6 n, M3 b+ W49ng/dL), 11-desoxycortisol (specific compound S)
& t8 o, y. w4 E) [' Y( x- Vwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
8 w- m' r$ |, L5 A3 r/ gtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
0 K2 ?7 Q0 }# c' g5 Htestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
8 F& ]5 k. f2 E9 `' Xand β-human chorionic gonadotropin was less than* V# |- M5 R% O- m: q& ?
5 mIU/mL (normal <5 mIU/mL). Serum follicular
! u5 ]/ w, w4 L+ N4 \" Fstimulating hormone and leuteinizing hormone/ _) @5 P. M: @4 S8 s
concentrations were less than 0.05 mIU/mL
, U! |9 z( L) K(prepubertal).3 m9 f8 ]! p/ R; n; P, \# l7 M
The parents were notified about the laboratory/ r7 F. {& j+ f6 n7 g
results and were informed that all of the tests were8 {0 K9 Q t- l4 E! t
normal except the testosterone level was high. The. S2 l7 Z* g, ~, O
follow-up visit was arranged within a few weeks to2 B" u. ^! y b `3 {
obtain testicular and abdominal sonograms; how-# v; D$ y& a& X3 G
ever, the family did not return for 4 months." x7 P4 t+ Q) J5 i3 H$ D6 m( J
Physical examination at this time revealed that the. k1 b. V" N7 t; r
child had grown 2.5 cm in 4 months and had gained
3 s0 o( A" N! n, f2 kg of weight. Physical examination remained. Y7 m5 c- [: c
unchanged. Surprisingly, the pubic hair almost com-
5 A' Y7 N) D+ j6 ^pletely disappeared except for a few vellous hairs at! L L8 @8 o D
the base of the phallus. Testicular volume was still 2
4 X+ u$ F+ {& `/ T$ mmL, and the size of the penis remained unchanged.8 P5 ^7 ^- L4 e4 I% S) y
The mother also said that the boy was no longer hav-
; L+ w" u1 }2 D5 N8 eing frequent erections.
% L) i1 r; p ^5 @9 R4 Z" uBoth parents were again questioned about use of) c% @: G6 b0 F2 u
any ointment/creams that they may have applied to
" K* g3 ?$ O" n# _' _- ithe child’s skin. This time the father admitted the: R0 b. C- d1 U
Topical Testosterone Exposure / Bhowmick et al 541, I3 Z7 u0 K# X6 _ w) d. J' v
use of testosterone gel twice daily that he was apply-; ~: g B) X( l
ing over his own shoulders, chest, and back area for9 }4 x6 I% |: p2 L. Z' ^
a year. The father also revealed he was embarrassed
" e0 o( [, f" Z# oto disclose that he was using a testosterone gel pre-
$ r3 s; E9 {8 ]" {; j3 @scribed by his family physician for decreased libido5 _4 {/ n ~" v; y
secondary to depression.0 u. r6 l; |4 j: a
The child slept in the same bed with parents.
0 R6 F. ^4 h% S( Q4 zThe father would hug the baby and hold him on his( D: }% w6 ~- o
chest for a considerable period of time, causing sig-
: G Q0 g# C$ A9 Bnificant bare skin contact between baby and father.) W1 N ~! c% O5 Z" {
The father also admitted that after the phone call,
# P4 u, H9 F! @; W) s# I; [when he learned the testosterone level in the baby, A7 M- X1 }# Q% T
was high, he then read the product information
$ ^, H1 t5 s8 u2 Q& y' w* Ppacket and concluded that it was most likely the rea-
2 _: v0 ]7 c c0 x( H; _" d3 _5 Y9 Mson for the child’s virilization. At that time, they; N6 a/ [) u' [- [/ M
decided to put the baby in a separate bed, and the
; C" q4 i, K# ~+ B) _6 W) ]1 Qfather was not hugging him with bare skin and had
' E. `9 w b* R' U$ b1 w- p% qbeen using protective clothing. A repeat testosterone& Z% G& |+ V g) z4 J4 o9 z" B
test was ordered, but the family did not go to the# X% b9 Q0 z- I: W
laboratory to obtain the test.8 L/ y6 z7 m2 E2 B, J
Discussion
% u7 h8 l' @- ?- G- m$ iPrecocious puberty in boys is defined as secondary$ T" \+ e5 y8 w1 J' A
sexual development before 9 years of age.1,4
- d8 M( H- J' V* p/ U, `$ \Precocious puberty is termed as central (true) when
! P" u5 k7 m- \0 v; {it is caused by the premature activation of hypo-: b# P8 m J, Y+ `( a1 a9 d
thalamic pituitary gonadal axis. CPP is more com-7 M- Z: M, c9 q. }. t
mon in girls than in boys.1,3 Most boys with CPP
: X8 E$ |+ `$ {% F+ b# gmay have a central nervous system lesion that is8 J. m8 c. T( f& G
responsible for the early activation of the hypothal-4 f+ n7 r( `; f8 O& A
amic pituitary gonadal axis.1-3 Thus, greater empha-6 D7 N4 E" w. [3 p b3 d6 i) l( N3 p
sis has been given to neuroradiologic imaging in% H @. e& y; u! S, i/ v: G
boys with precocious puberty. In addition to viril-* e4 Y1 J, H& W
ization, the clinical hallmark of CPP is the symmet-- ^, m) c/ f8 k0 H W! q7 K
rical testicular growth secondary to stimulation by6 F/ J. @/ g) r, y' Z% F% P
gonadotropins.1,3& D* a2 Y5 t! s% j8 P
Gonadotropin-independent peripheral preco-
! \3 H5 F! v) C, |1 L+ M) {cious puberty in boys also results from inappropriate
' s9 l# @/ @' L$ A; Q' n5 o# U, Qandrogenic stimulation from either endogenous or
* Q" y$ `) {; g- g2 p$ A8 Cexogenous sources, nonpituitary gonadotropin stim-8 ^( y# B+ ]0 b3 b- X1 Z- d% _
ulation, and rare activating mutations.3 Virilizing4 a. T' n* k5 o( q# C8 z( }
congenital adrenal hyperplasia producing excessive
9 C0 n& \4 a7 T/ p( Uadrenal androgens is a common cause of precocious
3 y# s7 Z+ v: W0 Epuberty in boys.3,4
& A2 C& Q2 |+ U& V/ E6 h2 WThe most common form of congenital adrenal
6 d1 C- ]6 o7 Q1 Khyperplasia is the 21-hydroxylase enzyme deficiency.
# ~$ c e: F$ d; lThe 11-β hydroxylase deficiency may also result in
/ x) o s3 p) I* u, X( Pexcessive adrenal androgen production, and rarely,
1 T f) h8 e( ]! o: pan adrenal tumor may also cause adrenal androgen% v" s0 G/ v) s4 u* T. a$ n
excess.1,3+ c, p3 H p# t' Y1 {+ w
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
. q3 c# `; T+ T8 @542 Clinical Pediatrics / Vol. 46, No. 6, July 20076 n3 c! s- z, ]; `2 z% X
A unique entity of male-limited gonadotropin- C- m6 c o0 q. j
independent precocious puberty, which is also known0 U, D7 y) D4 G
as testotoxicosis, may cause precocious puberty at a0 ], l% ?# L7 ~- B
very young age. The physical findings in these boys
! j7 A1 C. M5 L' M+ {3 c/ ] Swith this disorder are full pubertal development,
" L6 I8 v; ]$ R) C% B$ \including bilateral testicular growth, similar to boys
* t! \& b h- Iwith CPP. The gonadotropin levels in this disorder
) P$ O. [3 V' V2 h) b' u1 C) Pare suppressed to prepubertal levels and do not show
5 H9 z. K4 V7 p# M1 _9 U! \pubertal response of gonadotropin after gonadotropin-
* Z0 T8 e. q2 N# zreleasing hormone stimulation. This is a sex-linked* c. z; b l6 q1 R: ~
autosomal dominant disorder that affects only
: C3 ?4 i! K4 u& q; G1 Emales; therefore, other male members of the family
# W% H1 G+ L8 o! ^* @; _may have similar precocious puberty.3! C8 ~7 h- A7 ^, F* @
In our patient, physical examination was incon-3 N- J( v& E" Y) [4 d4 B
sistent with true precocious puberty since his testi-
/ A4 p- j) K. W5 Fcles were prepubertal in size. However, testotoxicosis
. O# A. Y5 u4 K$ U' S- {was in the differential diagnosis because his father1 e! L" g9 `- F" T: @- u
started puberty somewhat early, and occasionally,
t# y' X) |+ c! H( V; `testicular enlargement is not that evident in the+ `, B) O: d7 D' r
beginning of this process.1 In the absence of a neg-
. }" Z) X- `0 x# K+ c% B5 uative initial history of androgen exposure, our/ f$ j. p: t9 z8 u6 a( V
biggest concern was virilizing adrenal hyperplasia,
3 E- h4 }. v/ G: \either 21-hydroxylase deficiency or 11-β hydroxylase+ \8 }; p5 S6 g: z
deficiency. Those diagnoses were excluded by find-
$ D1 O8 E O$ x9 p9 E4 a0 Oing the normal level of adrenal steroids.
* r+ F# S+ L5 \* s8 I/ qThe diagnosis of exogenous androgens was strongly
3 I( O: y! c4 S5 V, s9 xsuspected in a follow-up visit after 4 months because% I. X- ^" \3 @* K* P7 U/ K S% ^
the physical examination revealed the complete disap-& F# x6 ` f; V* G g
pearance of pubic hair, normal growth velocity, and
- a1 `2 x7 N7 s+ Y3 }* L6 S9 Q7 cdecreased erections. The father admitted using a testos-8 G6 }& J7 S0 N
terone gel, which he concealed at first visit. He was
* B7 Y& u, C* z$ Eusing it rather frequently, twice a day. The Physicians’
& r* L* O5 m! G, z1 vDesk Reference, or package insert of this product, gel or
( D8 S x( K( u" ocream, cautions about dermal testosterone transfer to" y) q: [$ l3 u1 V
unprotected females through direct skin exposure.
# ~- z F5 a! ~2 k3 I GSerum testosterone level was found to be 2 times the( I, O; _; E L! c, k$ M R. O) ~
baseline value in those females who were exposed to
v+ D* _! p5 x( Eeven 15 minutes of direct skin contact with their male3 | u U3 D- H8 D9 d- e, L$ Q3 `
partners.6 However, when a shirt covered the applica- W9 P, | s$ Q- [8 |% ^. X
tion site, this testosterone transfer was prevented.+ I! s% a' H. Z' K8 Y7 N* m7 |
Our patient’s testosterone level was 60 ng/mL,
! W X2 i V, q! Lwhich was clearly high. Some studies suggest that
/ F/ O5 n; I& X, Zdermal conversion of testosterone to dihydrotestos-
. Z4 l5 ]; d2 E9 D wterone, which is a more potent metabolite, is more1 h* z1 o4 _8 \ K' F5 l
active in young children exposed to testosterone; v4 b. _4 \& y5 ~
exogenously7; however, we did not measure a dihy-, K7 ] B' m2 F' `1 b3 b0 [* D
drotestosterone level in our patient. In addition to
( _. A c9 }" p& avirilization, exposure to exogenous testosterone in3 C1 P/ t+ p8 d7 D1 d
children results in an increase in growth velocity and
% R& F Q0 l3 z( c4 Qadvanced bone age, as seen in our patient.
1 Z1 V e9 R. Q1 ^3 g" Y" ?6 FThe long-term effect of androgen exposure during. y. Q* E0 E+ i
early childhood on pubertal development and final- l' |! T. T6 B7 A8 [, |' s! |) y7 M
adult height are not fully known and always remain
+ K# H6 F/ t/ E2 l$ ta concern. Children treated with short-term testos-
- x L: \8 n% O9 Nterone injection or topical androgen may exhibit some
' {9 ?3 u% ^7 d$ wacceleration of the skeletal maturation; however, after" k4 o* G) d! P: ~3 k6 E1 W
cessation of treatment, the rate of bone maturation$ K" W) c Y/ [" F
decelerates and gradually returns to normal.8,92 p) U6 q" a$ v2 s3 J' S2 D# X
There are conflicting reports and controversy. z6 ?9 @0 c) k
over the effect of early androgen exposure on adult! T; e1 V8 B9 b- A4 `7 E
penile length.10,11 Some reports suggest subnormal
7 v3 g- x4 Q( ?adult penile length, apparently because of downreg-
5 a4 a4 B1 B0 y& a2 y; Q" p6 Yulation of androgen receptor number.10,12 However,, r3 n$ Q$ J# Q9 Z- @& d: j# E
Sutherland et al13 did not find a correlation between
& g4 I6 O( }; ^, q) C9 M+ }childhood testosterone exposure and reduced adult. _$ x, U0 ^- b4 x- b6 b
penile length in clinical studies.
) o5 y' R& l# h" WNonetheless, we do not believe our patient is% O6 V7 p; m" W/ q2 G% k& }9 z% y
going to experience any of the untoward effects from
" B; S. }. ]: R; Y5 P: Q c! ytestosterone exposure as mentioned earlier because9 h9 i U& l, X
the exposure was not for a prolonged period of time.. u+ S' s! t2 z# H" v
Although the bone age was advanced at the time of
' u% J8 h/ ]6 w g5 N; @/ |/ kdiagnosis, the child had a normal growth velocity at
7 Z- J! I# l. T7 q+ |2 tthe follow-up visit. It is hoped that his final adult; t% e7 ^ A5 X! q
height will not be affected.
+ X9 D/ ~9 D4 {" L& \" S4 QAlthough rarely reported, the widespread avail-
, H1 D) ]. S7 }ability of androgen products in our society may
$ u6 w0 J' ~5 u6 m% Y I" ]indeed cause more virilization in male or female0 M; S5 Y. ^# k7 i
children than one would realize. Exposure to andro-* r- ~7 L3 d$ }7 K' r
gen products must be considered and specific ques-+ J2 Y0 z' o8 W; k/ r
tioning about the use of a testosterone product or
7 D& w# _5 }4 m" _+ b! Tgel should be asked of the family members during
; a" Y, e0 X# y1 R# Dthe evaluation of any children who present with vir-& \0 T5 L4 s! x9 E
ilization or peripheral precocious puberty. The diag-! h, Q1 H9 \6 j* y; x; [7 h! u/ w
nosis can be established by just a few tests and by
, w) k* F) K4 @% V% U# Eappropriate history. The inability to obtain such a
2 x& D) Z% s n- n- H" phistory, or failure to ask the specific questions, may/ o" H5 m3 w7 D- u [4 i& P8 q6 M
result in extensive, unnecessary, and expensive
; P4 b# }1 P9 ]5 M* P4 Qinvestigation. The primary care physician should be
& H& i# `8 P( @' O! daware of this fact, because most of these children0 a* F5 _4 B- E) R
may initially present in their practice. The Physicians’
! M2 C) [. U& X& ODesk Reference and package insert should also put a
5 o& W1 ]1 k R6 Owarning about the virilizing effect on a male or
8 x- z) J# J+ e+ d5 pfemale child who might come in contact with some-" H1 V& `0 X) w2 e0 j
one using any of these products.: ~, B r8 K4 k3 h8 N; B0 U
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# s2 M& ~# I+ D! L7. Klugo RC, Cerny JC. Response of micropenis to topical
. u% r$ }+ T8 v, B5 Q6 J+ c' f' Ptestosterone and gonadotropin. J Urol. 1978;119:
# i2 L2 d) X7 I2 P, U+ U# {667-668.
" u. Y* |4 J( A8. Guthrie RD, Smith DW, Graham CB. Testosterone
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